content: /**
   * Copyright (c) 2016-present, RxJava Contributors.
   *
   * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in
   * compliance with the License. You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software distributed under the License is
   * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See
   * the License for the specific language governing permissions and limitations under the License.
   */
  
  package io.reactivex.observable.internal.operators;
  
  import static org.junit.Assert.*;
  
  import java.util.*;
  import java.util.concurrent.TimeUnit;
  
  import org.junit.*;
  
  import io.reactivex.common.TestScheduler;
  import io.reactivex.common.exceptions.TestException;
  import io.reactivex.observable.Observable;
  import io.reactivex.observable.subjects.*;
  
  public class BlockingObservableMostRecentTest {
      @Test
      public void testMostRecentNull() {
          assertEquals(null, Observable.<Void>never().blockingMostRecent(null).iterator().next());
      }
  
      static <T> Iterable<T> mostRecent(Observable<T> source, T initialValue) {
          return source.blockingMostRecent(initialValue);
      }
  
      @Test
      public void testMostRecent() {
          Subject<String> s = PublishSubject.create();
  
          Iterator<String> it = mostRecent(s, "default").iterator();
  
          assertTrue(it.hasNext());
          assertEquals("default", it.next());
          assertEquals("default", it.next());
  
          s.onNext("one");
          assertTrue(it.hasNext());
          assertEquals("one", it.next());
          assertEquals("one", it.next());
  
          s.onNext("two");
          assertTrue(it.hasNext());
          assertEquals("two", it.next());
          assertEquals("two", it.next());
  
          s.onComplete();
          assertFalse(it.hasNext());
  
      }
  
      @Test(expected = TestException.class)
      public void testMostRecentWithException() {
          Subject<String> s = PublishSubject.create();
  
          Iterator<String> it = mostRecent(s, "default").iterator();
  
          assertTrue(it.hasNext());
          assertEquals("default", it.next());
          assertEquals("default", it.next());
  
          s.onError(new TestException());
          assertTrue(it.hasNext());
  
          it.next();
      }
  
      @Test(timeout = 1000)
      public void testSingleSourceManyIterators() {
          TestScheduler scheduler = new TestScheduler();
          Observable<Long> source = Observable.interval(1, TimeUnit.SECONDS, scheduler).take(10);
  
          Iterable<Long> iter = source.blockingMostRecent(-1L);
  
          for (int j = 0; j < 3; j++) {
              Iterator<Long> it = iter.iterator();
  
              Assert.assertEquals(Long.valueOf(-1), it.next());
  
              for (int i = 0; i < 9; i++) {
                  scheduler.advanceTimeBy(1, TimeUnit.SECONDS);
  
                  Assert.assertEquals(true, it.hasNext());
                  Assert.assertEquals(Long.valueOf(i), it.next());
              }
              scheduler.advanceTimeBy(1, TimeUnit.SECONDS);
  
              Assert.assertEquals(false, it.hasNext());
          }
  
      }
  
      @Test
      public void empty() {
          Iterator<Integer> it = Observable.<Integer>empty()
          .blockingMostRecent(1)
          .iterator();
  
          try {
              it.next();
              fail("Should have thrown");
          } catch (NoSuchElementException ex) {
              // expected
          }
  
          try {
              it.remove();
              fail("Should have thrown");
          } catch (UnsupportedOperationException ex) {
              // expected
          }
      }
  }
  